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When an enclosed housing (IP 54) is cooled, whether by way of climate control components or outdoors by the ambient air, condensation is able to form on cold surfaces inside the housing. This is practically always the case at the evaporator in cooling units and at the heat exchanger elements in air/water heat exchangers.
The formation of condensation as a result of a change in temperature is dependent on the relative humidity of the air in the housing and can be calculated from the Mollier-h,x diagram.
Example: Cooling from 35°C and 70% rel. humidity (= 24g water per kg dry air) to 18°C ? leads to 100% rel. humidity with 13g water per kg dry air and thus to a difference of 11g water per kg dry air. The total amount of condensation is obtained by multiplying this difference with the mass of the air in the housing.
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